We have a Teacher Charm Keychain nos.  It dates somewhere from the late 1990's - mid 2000's.  It measures about 4 1/8" in L with the center ring measuring about 1 1/8" across the center.  The A+ measures about 1 1/4" x 1" to give an idea of scale.  It is in the original package.

Keychain Teacher Charm nos